|Sensor Lead Wires Positioned on SiC-based Monolithic Ceramic and Fiber- reinforced Ceramic Matrix Composite Subcomponents with Flat and Curved Surfaces - Kiser, James D.|
There is strong interest in the development of silicon carbide-based monolithic ceramic and composite materials and components for demanding, high-temperature applications. Thorough characterization of material properties, including high-temperature testing under simulated or actual operating conditions, is a high priority for programs involved in developing these silicon carbide- (SiC) based materials and components...
Keywords: AIRCRAFT SAFETY; AIRLINE OPERATIONS; MAINTENANCE; FLIGHT SAFETY
|A Gas Chromatograph/Mass Spectrometer System for UltraLow-Emission Combustor Exhaust Studies - Brabbs, Theodore A.|
A gas chromatograph (GC)/mass spectrometer (MS) system that allows the speciation of unburnt hydrocarbons in the combustor exhaust has been developed at the NASA Lewis Research Center. Combustion gas samples are withdrawn through a water-cooled sampling probe which, when not in use, is protected from contamination by a high-pressure nitrogen purge. The sample line and its connecting lines, filters, and valves are all ultraclean and are heated to avoid condensation...
Keywords: FLIGHT TRAINING; INSTRUCTORS; RESOURCES MANAGEMENT; RATINGS; CIVIL AVIATION; AIRLINE OPERATIONS
|Angular Distribution of Elastically Scattered Electrons Determined and Its Effect on Collector Performance Computed - Krainsky, Isay L.|
It has been demonstrated that the suppression of secondary electron emission significantly improves the performance of electron beam collectors (ref. 1). However, a complete analysis of the effects of secondary electron emission with respect to collector performance has not been possible because of the lack of quantitative data on angular distributions of secondary electrons. Secondary electrons are emitted with energies ranging from near zero to the energy of the incident primary...
Keywords: AIRLINE OPERATIONS; PRODUCTIVITY; COMMERCIAL AIRCRAFT; CIVIL AVIATION; WARFARE; RISK
|Mitigation of the Impact of Sensing Noise on the Precise Formation Flying Control Problem - Alfriend, K. T|
The specific objectives of this proposed research were: 1. Further investigation into the impact of CDGPS sensing errors for high Earth orbit missions. 2. Identify augmentation approaches of the CDGPS that will improve the relative state for low and high Earth orbit missions. 3. Integration of the navigation and control concepts into the GSFC Formation Flying Testbed. In addition this was a cooperative effort with Dr...
Keywords: TRANSPORTATION NETWORKS; AIR TRANSPORTATION; MANAGEMENT METHODS; TOPOLOGY; AIRLINE OPERATIONS; SCALING
|Three-Dimensional High-Order Spectral Finite Volume Method for Unstructured Grids - Liu, Yen|
Many areas require a very high-order accurate numerical solution of conservation laws for complex shapes. This paper deals with the extension to three dimensions of the Spectral Finite Volume (SV) method for unstructured grids, which was developed to solve such problems. We first summarize the limitations of traditional methods such as finite-difference, and finite-volume for both structured and unstructured grids...
Keywords: AIRPORTS; SOCIOLOGY; AIRLINE OPERATIONS; HUMAN RELATIONS; PASSENGERS; INFORMATION SYSTEMS; TRANSPORTATION
|SIGNALS OF HUMAN OPERATOR STATE - LUKYANOV, A. N., et al|
SIGNALS OF HUMAN OPERATOR STATE IN MAN MACHINE SYSTEMS
Keywords: AIRLINE OPERATIONS; COST EFFECTIVENESS; VISIBILITY; AIR TRAFFIC CONTROL; METEOROLOGICAL PARAMETERS
|Towards a Theory of Tropical/Midlatitude Mass Exchange from the Earth's Surface through the Stratosphere - Hartley, Dan|
The main findings of this research project have been the following: (1) there is a significant feedback from the stratosphere on tropospheric dynamics, and (2) a detailed analysis of the interaction between tropical and polar wave breaking in controlling stratospheric mixing. Two papers are were written and are included. The first paper is titled, ''A New Perspective on the Dynamical Link Between the Stratosphere and Troposphere.'' Atmospheric processes of tropospheric origin can perturb the str...
Keywords: AIR TRANSPORTATION; POLICIES; COMPETITION; AIRLINE OPERATIONS; CONFERENCES; RESEARCH; SAFETY
|Activity Planning for the Mars Exploration Rovers - Bresina, John L.|
Operating the Mars Exploration Rovers is a challenging, time-pressured task. Each day, the operations team must generate a new plan describing the rover activities for the next day. These plans must abide by resource limitations, safety rules, and temporal constraints. The objective is to achieve as much science as possible, choosing from a set of observation requests that oversubscribe rover resources...
Keywords: AIR TRANSPORTATION; AIRLINE OPERATIONS; ROUTES; PASSENGERS; ELASTIC PROPERTIES; REGRESSION ANALYSIS; COMMERCE; ESTIMATING
|Spectroscopic Studies of Pre-Biotic Carbon Chemistry - Blake, Geoffrey A|
As described in the original proposal and in our progress reports, research in the Blake group supported by the Exobiology program seeks to understand the pre-biotic chemistry of carbon along with that of other first- and second-row elements from the earliest stages of star formation through the development of planetary systems. The major tool used is spectroscopy, and the program has observational, laboratory, and theoretical components...
Keywords: AIRLINE OPERATIONS; DOCUMENTS; AIR TRANSPORTATION; COMMERCIAL AIRCRAFT; CONSUMERS; SURVEYS; EVALUATION; PASSENGERS; INFORMATION ANALYSIS; INFORMATION DISSEMINATION
|Anomolous Fatigue Crack Growth Phenomena in High-Strength Steel - Forth, Scott C.|
The growth of a fatigue crack through a material is the result of a complex interaction between the applied loading, component geometry, three-dimensional constraint, load history, environment, material microstructure and several other factors. Previous studies have developed experimental and computational methods to relate the fatigue crack growth rate to many of the above conditions, with the intent of discovering some fundamental material response, i.e...
Keywords: AIR TRANSPORTATION; ECONOMIC FACTORS; REGULATIONS; GOVERNMENT/INDUSTRY RELATIONS; AIRLINE OPERATIONS; COSTS; QUALITY; EFFECTIVENESS; TRANSPORTATION NETWORKS; OPTIMIZATION
|Effects of Fiber Coating Composition on Mechanical Behavior of Silicon Carbide Fiber-Reinforced Celsian Composites - Bansal, Narottam P.|
Celsian matrix composites reinforced with Hi-Nicalon fibers, precoated with a dual layer of BN/SiC by chemical vapor deposition in two separate batches, were fabricated. Mechanical properties of the composites were measured in three-point flexure. Despite supposedly identical processing, the composite panels fabricated with fibers coated in two batches exhibited substantially different mechanical behavior...
Keywords: AIR TRANSPORTATION; AIRLINE OPERATIONS; AIRPORTS; AIRCRAFT NOISE; NOISE REDUCTION; FLIGHT PATHS; SYSTEMS ANALYSIS; OPERATING COSTS; RUNWAYS
|A new approach to long-life noncontacting electromechanical devices - Devine, E. J|
Brushless dc motors are finding increasing application in space. Likewise, with the advent of the light emitting diode, noncontacting encoders are gradually replacing sliding contact types. The direct drive concept has proved its merit and is now the preferred approach for tape recorders and low to moderate torque instrument drives. The final step in this evolution is the magnetic bearing, which now appears feasible for several applications...
Keywords: AIRCRAFT LANDING; AIRPORT BEACONS; INSTRUMENT LANDING SYSTEMS; TERMINAL FACILITIES; AIRLINE OPERATIONS; APPROACH CONTROL; FLIGHT SAFETY; RUNWAYS
|A New Variability Parameter for Gamma-Ray Burst Time Profiles - Lestrade, John Patric|
We present a parameter that measures the structure of gamma-ray burst time profiles. This parameter is based on the statistics of runs and is a good measure of time profile variability. It is shown to be independent of burst duration and less sensitive to burst distance than algorithms that depend directly on the intensity of a burst.
Keywords: AIR TRANSPORTATION; FINANCE; EUROPE; AIRLINE OPERATIONS; AIRPORTS; CONFERENCES; COST ANALYSIS; MARKET RESEARCH; JAPAN; OPERATING COSTS; NETWORKS
|Tests of a mixed compression axisymmetric inlet with large transonic mass flow at Mach numbers 0.6 to 2.65 - Smeltzer, D. B.|
A 38.8-cm (15.28-in.) capture diameter model of a mixed-compression axisymmetric inlet system with a translating cowl was designed and tested. The internal contours, designed for Mach number 2.65, provided a throat area of 59 percent of the capture area when the cowl was retracted for transonic operation. Other model features included a boundary-layer removal system, vortex generators, an engine airflow bypass system, cowl support struts, and rotating rakes at the engine face...
Keywords: COMBUSTION PRODUCTS; EXHAUST GASES; JET EXHAUST; SUPERSONIC FLIGHT; AIRLINE OPERATIONS; ENVIRONMENT POLLUTION; NUMERICAL ANALYSIS; STRATOSPHERE
|Plasma Heating and Ultrafast Semiconductor Laser Modulation Through a Terahertz Heating Field - Li, Jian-Zhong|
Electron-hole plasma heating and ultrafast modulation in a semiconductor laser under a terahertz electrical field are investigated using a set of hydrodynamic equations derived from the semiconductor Bloch equations. The self-consistent treatment of lasing and heating processes leads to the prediction of a strong saturation and degradation of modulation depth even at moderate terahertz field intensity...
Keywords: FLIGHT TESTS; AIRCRAFT WAKES; TURBULENCE; VORTICES; AIRLINE OPERATIONS; NASA PROGRAMS; DATA BASES; SAFETY
|Investigation of Lithium Ion Storage - Lee, Leonine|
The objective of the Storage Study is to establish a best long term storage for the lithium cells, to determine the preferred solstice condition for the lithium ion chemistry (polymer and liquid electrolyte, and to compare voltage clamped with trickle charge storage. The study is presented is viewgraph form.
Keywords: AIRLINE OPERATIONS; AIR TRANSPORTATION; TOTAL QUALITY MANAGEMENT; RATINGS; CONSUMERS; BAGGAGE; GRAPHS (CHARTS); AIRCRAFT ACCIDENTS; ARRIVALS
|Characterization of Individual Aerosol Particles Associated with Clouds (CRYSTAL-FACE) - Buseck, Peter R|
The aim of our research was to obtain data on the chemical and physical properties of individual aerosol particles from near the bottoms and tops of the deep convective systems that lead to the generation of tropical cirrus clouds and to provide insights into the particles that serve as CCN or IN. We used analytical transmission electron microscopy (ATEM), including energy-dispersive X-ray spectrometry (EDS) and electron energy-loss spectroscopy (EELS), and field-emission electron microscopy (FE...
Keywords: AIRLINE OPERATIONS; AVIONICS; STANDARDIZATION; ECONOMICS; MANAGEMENT PLANNING; COST REDUCTION; POWER PLANTS; AIRCRAFT MODELS
|Further Progress in Noise Source Identification in High Speed Jets via Causality Principle - Panda, J.|
To locate noise sources in high-speed jets, the sound pressure fluctuations p/, measured at far field locations, were correlated with each of density p, axial velocity u, radial velocity v, puu and pvv fluctuations measured from various points in fully expanded, unheated plumes of Mach number 0.95, 1.4 and 1.8. The velocity and density fluctuations were measured simultaneously using a recently developed, non-intrusive, point measurement technique based on molecular Rayleigh scattering (Seasholtz...
Keywords: MARKETING; AIR TRANSPORTATION; AIRLINE OPERATIONS; CONFERENCES; BLENDED-WING-BODY CONFIGURATIONS; CONSUMERS; ETHNIC FACTORS; AIRPORTS
|Aerial Vehicle Surveys of other Planetary Atmospheres and Surfaces: Imaging, Remote-sensing, and Autonomy Technology Requirements - Young, Larry A.|
The objective of this paper is to review the anticipated imaging and remote-sensing technology requirements for aerial vehicle survey missions to other planetary bodies in our Solar system that can support in-atmosphere flight. In the not too distant future such planetary aerial vehicle (a.k.a. aerial explorers) exploration missions will become feasible. Imaging and remote-sensing observations will be a key objective for these missions...
Keywords: AIR TRANSPORTATION; AIRLINE OPERATIONS; CIVIL AVIATION; COSTS; LOADS (FORCES); PASSENGERS; TRAFFIC; AIRCRAFT INDUSTRY; REVENUE
|Unified Models of Turbulence and Nonlinear Wave Evolution in the Extended Solar Corona and Solar Wind - Cranmer, Steven R|
The paper discusses the following: 1. No-cost Extension. The no-cost extension is required to complete the work on the unified model codes (both hydrodynamic and kinetic Monte Carlo) as described in the initial proposal and previous annual reports. 2. Scientific Accomplishments during the Report Period. We completed a comprehensive model of Alfvtn wave reflection that spans the full distance from the photosphere to the distant heliosphere...
Keywords: AIR TRAFFIC CONTROL; AIRSPACE; EUROPE; AIR TRANSPORTATION; AIRCRAFT INDUSTRY; COSTS; DEMAND (ECONOMICS); AIRLINE OPERATIONS
|Extraction of Profile Information from Cloud Contaminated Radiances - Smith, W. L.|
Clouds act to reduce the signal level and may produce noise dependence on the complexity of the cloud properties and the manner in which they are treated in the profile retrieval process. There are essentially three ways to extract profile information from cloud contaminated radiances: (1) cloud-clearing using spatially adjacent cloud contaminated radiance measurements, (2) retrieval based upon the assumption of opaque cloud conditions, and (3) retrieval or radiance assimilation using a physical...
Keywords: AIRPORTS; PASSENGERS; COMMERCIAL AIRCRAFT; AIR TRANSPORTATION; AIRLINE OPERATIONS; COMPETITION; MOTIVATION; PERCEPTION; SURVEYS
|Technical Report Series on Global Modeling and Data Assimilation - Takacs, Lawrence L.|
This report documents the techniques used to filter quantities on a stretched grid general circulation model. Standard high-latitude filtering techniques (e.g., using an FFT (Fast Fourier Transformations) to decompose and filter unstable harmonics at selected latitudes) applied on a stretched grid are shown to produce significant distortions of the prognostic state when used to control instabilities near the pole...
Keywords: CONFERENCES; FINANCE; AIR TRANSPORTATION; ORGANIZATIONS; MATHEMATICAL MODELS; AIRLINE OPERATIONS; PRODUCTIVITY; POLICIES; PASSENGERS; COSTS
|Methane Production by Microbial Mats Under Low Sulfate Concentrations - Bebout, Brad M.|
Cyanobacterial mats collected in hypersaline salterns were incubated in a greenhouse under low sulfate concentrations ([SO4]) and examined for their primary productivity and emissions of methane and other major carbon species. Atmospheric greenhouse warming by gases such as carbon dioxide and methane must have been greater during the Archean than today in order to account for a record of moderate to warm paleoclemates, despite a less luminous early sun...
Keywords: AIRLINE OPERATIONS; INFORMATION MANAGEMENT; AIR TRAFFIC CONTROL; AIRPORTS; REAL TIME OPERATION; TIME LAG; BAGGAGE; GROUND HANDLING
|DSMC Grid Methodologies for Computing Low-Density, Hypersonic Flows About Reusable Launch Vehicles - Wilmoth, Richard G.|
Two different grid methodologies are studied for application to DSMC simulations about reusable launch vehicles. One method uses an unstructured, tetrahedral grid while the other uses a structured, variable-resolution Cartesian grid. The relative merits of each method are discussed in terms of accuracy, computational efficiency, and overall ease of use. Both methods are applied to the computation of a low-density, hypersonic flow about a winged single-stage-to-orbit reusable launch vehicle conce...
Keywords: FREE FLIGHT; COST ANALYSIS; WEATHER; AIR TRANSPORTATION; TERMINALS; CIVIL AVIATION; AIRLINE OPERATIONS; AIRPORTS; LOGISTICS; AIRSPACE
|SiC-Based Gas Sensor Development - Hunter, G. W.|
Silicon carbide based Schottky diode gas sensors are being developed for applications such as emission measurements and leak detection. The effects of the geometry of the tin oxide film in a Pd/SnO2/SiC structure will be discussed as well as improvements in packaging SiC-based sensors. It is concluded that there is considerable versatility in the formation of SiC-based Schottky diode gas sensing structures which will potentially allow the fabrication of a SiC-based gas sensor array for a variety...
Keywords: CONFERENCES; AIRPORTS; AIR TRANSPORTATION; AIRLINE OPERATIONS; SAFETY; UNITED KINGDOM; STABILITY; COMMERCIAL AIRCRAFT; CIVIL AVIATION; CANADA
|The Hurricane-Flood-Landslide Continuum - Negri, Andrew J.|
In August 2004, representatives from NOAA, NASA, the USGS, and other government agencies convened in San Juan, Puerto Rim for a workshop to discuss a proposed research project called the Hurricane-Flood-Landslide Continuum (HFLC). The essence of the HFLC is to develop and integrate tools across disciplines to enable the issuance of regional guidance products for floods and landslides associated with major tropical rain systems, with sufficient lead time that local emergency managers can protect ...
Keywords: AIRPORTS; LOADS (FORCES); ECONOMICS; MARKET RESEARCH; MATHEMATICAL MODELS; COSTS; CONSUMERS; AIRLINE OPERATIONS; ASYMMETRY; PASSENGERS
|Finite Ground Coplanar (FGC) Waveguide: Characteristics and Advantages Evaluated for Radiofrequency and Wireless Communication Circuits - Ponchak, George E|
Researchers in NASA Lewis Research Center s Electron Device Technology Branch are developing transmission lines for radiofrequency and wireless circuits that are more efficient, smaller, and make lower cost circuits possible. Traditionally, radiofrequency and wireless circuits have employed a microstrip or coplanar waveguide to interconnect the various electrical elements that comprise a circuit. Although a coplanar waveguide (CPW) is widely viewed as better than a microstrip for most applicatio...
Keywords: ECONOMIC IMPACT; AIRLINE OPERATIONS; COMMERCIAL AIRCRAFT; CIVIL AVIATION; ECONOMICS; LOW COST
|Accelerator Facilities for Radiation Research - Cucinotta, Francis A|
HSRP Goals in Accelerator Use and Development are: 1.Need for ground-based heavy ion and proton facility to understand space radiation effects discussed most recently by NAS/NRC Report (1996). 2. Strategic Program Goals in facility usage and development: -(1) operation of AGS for approximately 600 beam hours/year; (2) operation of Loma Linda University (LLU) proton facility for approximately 400 beam hours/year; (3) construction of BAF facility; and (4) collaborative research at HIMAC in Japan a...
Keywords: CONFERENCES; STRAITS; HUBS; POLICIES; AIR TRANSPORTATION; TAIWAN; ASIA; CHINA; AIRLINE OPERATIONS; LAWS; PASSENGERS; POLITICS
|Calculation of Turbine Axial Thrust by Coupled CFD Simulations of the Main Flow Path and Secondary Cavity Flow in an SLI LOX Turbine - Dorney, D. J.|
Each single reusable Space Launch Initiative (SLI) booster rocket is an engine operating at a record vacuum thrust level of over 730,000 Ibf using LOX and LH2. This thrust is more than 10% greater than that of the Delta IV rocket, resulting in relatively large LOX and LH2 turbopumps. Since the SLI rocket employs a staged combustion cycle the level of pressure is very high (thousands of psia). This high pressure creates many engineering challenges, including the balancing of axial-forces on the t...
Keywords: AIRLINE OPERATIONS; FLIGHT SAFETY; INFORMATION SYSTEMS; DATA INTEGRATION; CIVIL AVIATION; RADAR DATA; WEATHER; PROTOTYPES; DATA PROCESSING
|Canard-body-tail missile test at angles of attack to 50 deg in the Ames 11-foot transonic wind tunnel - Allen, C. Q.|
Blunted ogive cylinder missile models with a length-to-diameter ratio of 10.4 were tested at transonic speeds and large angles of attack in an 11 foot transonic wind tunnel. The configurations are: body, body with tail panels, body with canards, and body with canards and tails. Forces and moments from the entire model and each of the eight fins were measured over the pitch range of 20 deg to 50 deg, and roll angles of 0 deg to 45 deg and canard deflection angles between 0 deg and 15 deg...
Keywords: AIR CARGO; AIR TRANSPORTATION; REGULATIONS; AIRCRAFT NOISE; AIRLINE OPERATIONS; ECONOMIC ANALYSIS; LAW (JURISPRUDENCE); PREDICTIONS
|Automating CapCom Using Mobile Agents and Robotic Assistants - Clancey, William J.|
We have developed and tested an advanced EVA communications and computing system to increase astronaut self-reliance and safety, reducing dependence on continuous monitoring and advising from mission control on Earth. This system, called Mobile Agents (MA), is voice controlled and provides information verbally to the astronauts through programs called personal agents. The system partly automates the role of CapCom in Apollo-including monitoring and managing EVA navigation, scheduling, equipment ...
Keywords: COMMERCIAL AIRCRAFT; TAIWAN; SELECTION; SEATS; PASSENGERS; EXPANSION; CIVIL AVIATION; AIRLINE OPERATIONS; AIR TRANSPORTATION; COMFORT; TRADEOFFS
|Development of a Spectral Model Based on Charge Transport for the Swift/BAT 32K CdZnTe Detector Array - Sato, Goro|
The properties of 32K CdZnTe (4 x 4 sq mm large, 2 mm thick) detectors have been studied in the pre-flight calibration of the Burst Alert Telescope (BAT) on-board the Swift Gamma-ray Burst Explorer (scheduled for launch in November 2004). In order to understand the energy response of the BAT CdZnTe array, we first quantify the mobility-lifetime (mu tau) products of carriers in individual CdZnTe detectors, which produce a position dependency in the charge induction efficiency and results in a low...
Keywords: AIR TRANSPORTATION; ALASKA; AIRLINE OPERATIONS; CIVIL AVIATION; COMMERCIAL AIRCRAFT; RATINGS; PASSENGERS; BAGGAGE; AIRCRAFT INDUSTRY; AIRPORTS
|Hyper-spectral Atmospheric Sounding - Smith, W. L.|
The Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS) is the first hyper-spectral remote sounding system to be orbited aboard a geosynchronous satellite. The GETS is designed to obtain revolutionary observations of the four dimensional atmospheric temperature, moisture, and wind structure as well as the distribution of the atmospheric trace gases, CO and O3. Although GIFTS will not be orbited until 2006-2008, a glimpse at the its measurement capabilities has been obtained by analyzin...
Keywords: AIR TRANSPORTATION; NASA PROGRAMS; AIRLINE OPERATIONS; CIVIL AVIATION; AIRPORTS; BIBLIOGRAPHIES; CONFERENCES; MANUALS; EDUCATION
|BENCAL Cruise Report - Barlow, Ray|
This report documents the scientific activities on board the South African Fisheries Research Ship (FRS) Africana during an ocean color calibration and validation cruise in the Benguela upwelling ecosystem (BEN-CAL), 4-17 October 2002. The cruise, denoted Afncana voyage 170, was staged in the southern Benguela between Cape Town and the Orange River within the region 14-18.5 deg E,29-34 deg S, with 15 scientists participat- ing from seven different international organizations...
Keywords: AIRCRAFT NOISE; NOISE INTENSITY; AIRPORTS; NOISE MEASUREMENT; CIVIL AVIATION; NOISE REDUCTION; AIRLINE OPERATIONS
|REDUCING THE STRUCTURAL AND FUNCTIONAL REDUNDANCY IN COMPLEX INFORMATION SYSTEMS - DUBROV, Y. A|
A FINITE SYSTEM, DEVELOPED BY THE AUTHOR, IS USED TO STUDY SOME PROBLEMS OF COMPLEX INFORMATION SYSTEMS. SIGNIFICANT ATTENTION IS DEVOTED TO QUESTIONS OF EQUIVALENT SYSTEM TRANSFORMATIONS, SINCE SUCH TRANSFORMATIONS MAKE IT POSSIBLE TO ELIMINATE STRUCTURAL AND FUNCTIONAL REDUNDANCY IN COMPLEX INFORMATION SYSTEMS.
Keywords: AIRLINE OPERATIONS; ATMOSPHERIC TURBULENCE; HUMAN FACTORS ENGINEERING; PASSENGERS; APPLICATIONS OF MATHEMATICS; EQUATIONS OF STATE; MATHEMATICAL MODELS
|Adaptive Development - NON|
The goal of this research is to develop and demonstrate innovative adaptive seal technologies that can lead to dramatic improvements in engine performance, life, range, and emissions, and enhance operability for next generation gas turbine engines. This work is concentrated on the development of self-adaptive clearance control systems for gas turbine engines. Researchers have targeted the high-pressure turbine (HPT) blade tip seal location for following reasons: Current active clearance control ...
Keywords: ROUTES; COMMERCIAL AIRCRAFT; AIRLINE OPERATIONS; AIR TRAFFIC; DIMENSIONAL ANALYSIS; AIR TRANSPORTATION; ECONOMICS; POLICIES; SELECTION; CIVIL AVIATION
|Hybrid Thermal Control Testing of a Cryogenic Propellant Tank - Plachta, David W|
This report presents the experimental results of a hybrid thermal control system, one that integrates a passive system (multi-layer insulation) with an active system (a mechanical cyrocooler) applied to cryogenic propellant storage. These experiments were performed on a 1.39 m diameter spherical propellant tank filled with LH2 while installed in an evacuated chamber. The tank heat transfer to the cryocooler was accomplished with a condenser installed in the ullage of the tank and mated to the se...
Keywords: CONFERENCES; AIR TRANSPORTATION; AIRLINE OPERATIONS; COMPETITION; COST ANALYSIS; DEMAND (ECONOMICS); MATHEMATICAL MODELS; COMMERCE; POLICIES
|Computers Take Flight: A History of NASA's Pioneering Digital Fly-By-Wire Project - Tomayko, James E|
An overview of the NASA F-8 Fly-by Wire project is presented. The project made two significant contributions to the new technology: (1) a solid design base of techniques that work and those that do not, and (2) credible evidence of good flying qualities and the ability of such a system to tolerate real faults and to continue operation without degradation. In 1972 the F-8C aircraft used in the program became he first digital fly-by-wire aircraft to operate without a mechanical backup system.
Keywords: AIRLINE OPERATIONS; TRANSPORTATION NETWORKS; NETWORK ANALYSIS; ECONOMIC ANALYSIS; COMPETITION; MANAGEMENT METHODS; ECONOMIC FACTORS; REGULATIONS
|Holographic Optical Data Storage - Timucin, Dogan A.|
Although the basic idea may be traced back to the earlier X-ray diffraction studies of Sir W. L. Bragg, the holographic method as we know it was invented by D. Gabor in 1948 as a two-step lensless imaging technique to enhance the resolution of electron microscopy, for which he received the 1971 Nobel Prize in physics. The distinctive feature of holography is the recording of the object phase variations that carry the depth information, which is lost in conventional photography where only the int...
Keywords: AIRCRAFT SAFETY; INFORMATION DISSEMINATION; RADIO COMMUNICATION; SATELLITE COMMUNICATION; AVIATION METEOROLOGY; AIRLINE OPERATIONS; FLIGHT CONDITIONS; ACCIDENT PREVENTION
|Exploration of Uncertainty in Glacier Modelling - Thompson, David E|
There are procedures and methods for verification of coding algebra and for validations of models and calculations that are in use in the aerospace computational fluid dynamics (CFD) community. These methods would be efficacious if used by the glacier dynamics modelling community. This paper is a presentation of some of those methods, and how they might be applied to uncertainty management supporting code verification and model validation for glacier dynamics...
Keywords: AIR TRANSPORTATION; AIRLINE OPERATIONS; ECONOMIC DEVELOPMENT; POLICIES; CONFERENCES; CHINA; JAPAN; KOREA
|Activities of Research Institute for Advanced Computer Science - Leiner, Barry M|
The Research Institute for Advanced Computer Science (RIACS) carries out basic research and technology development in computer science, in support of the National Aeronautics and Space Administrations missions. RIACS is located at the NASA Ames Research Center, Moffett Field, California. RIACS research focuses on the three cornerstones of IT research necessary to meet the future challenges of NASA missions: 1...
Keywords: AIRLINE OPERATIONS; GROUND OPERATIONAL SUPPORT SYSTEM; DECISION MAKING; AIRPORTS; PREDICTIONS; ESTIMATES
|DOT/NASA comparative assessment of Brayton engines for guideway vehicle and buses. Volume 1: Summary - NON|
The Department of Transportation requested that the NASA Office of Aeronautics and Space Technology evaluate and assess the potential of several types of gas turbine engines and fuels for the on-board power and propulsion of a future heavy-duty ground transportation system. The purpose of the investigation was threefold: (1) to provide a definition of the potential for turbine engines to minimize pollution, energy consumption, and noise; (2) to provide a useful means of comparison of the types o...
Keywords: AERODYNAMIC CONFIGURATIONS; AIRCRAFT DESIGN; SUPERSONIC SPEED; TECHNOLOGY ASSESSMENT; AIRCRAFT PERFORMANCE; AIRLINE OPERATIONS; COST EFFECTIVENESS; DATA PROCESSING
|Air traffic control surveillance accuracy and update rate study - Craigie, J. H.|
The results of an air traffic control surveillance accuracy and update rate study are presented. The objective of the study was to establish quantitative relationships between the surveillance accuracies, update rates, and the communication load associated with the tactical control of aircraft for conflict resolution. The relationships are established for typical types of aircraft, phases of flight, and types of airspace...
Keywords: AIRLINE OPERATIONS; COMFORT; PASSENGER AIRCRAFT; AIRCRAFT SAFETY; HUMAN FACTORS ENGINEERING; SEATS; TEMPERATURE
|Applications of radio interferometry to navigation - Knowles, S. H.|
Radio astronomy experiments have demonstrated the feasibility of making precise position measurements using interferometry techniques. The application of this method to navigation and marine geodesy is discussed, and comparisons are made with existing navigation systems. The very long baseline technique, with a master station, can use either an artificial satellite or natural sources as position references; a high-speed data link is required...
Keywords: AIRCRAFT LANDING; BOEING 727 AIRCRAFT; FLIGHT TESTS; NOISE REDUCTION; AIRLINE OPERATIONS; APPROACH; AVIONICS; COSTS
|Flight Test Comparison Between Enhanced Vision (FLIR) and Synthetic Vision Systems - Arthur, Jarvis J., III|
Limited visibility and reduced situational awareness have been cited as predominant causal factors for both Controlled Flight Into Terrain (CFIT) and runway incursion accidents. NASA s Synthetic Vision Systems (SVS) project is developing practical application technologies with the goal of eliminating low visibility conditions as a causal factor to civil aircraft accidents while replicating the operational benefits of clear day flight operations, regardless of the actual outside visibility condit...
Keywords: AIR TRANSPORTATION; AIRLINE OPERATIONS; CIVIL AVIATION; TRANSPORTATION NETWORKS; EUROPE; LOW COST; REGULATIONS; AIRPORTS
|Improving Aviation Safety with information Visualization: A Flight Simulation Study - Aragon, Cecilia R.|
Many aircraft accidents each year are caused by encounters with invisible airflow hazards. Recent advances in aviation sensor technology offer the potential for aircraft-based sensors that can gather large amounts of airflow velocity data in real-time. With this influx of data comes the need to study how best to present it to the pilot - a cognitively overloaded user focused on a primary task other than that of information visualization...
Keywords: CONSUMERS; AIR TRANSPORTATION; AIRLINE OPERATIONS; DEPENDENT VARIABLES; MARKET RESEARCH; SEATS; COSTS; AUSTRALIA
|A 3-D CFD Analysis of the Space Shuttle RSRM With Propellant Fins 1 sec. Burn-Back - Morstadt, Robert A|
In this study 3-D Computational Fluid Dynamic (CFD) runs have been made for the Space Shuttle RSRM using 2 different grids and 4 different turbulent models, which were the Standard KE, the RNG KE, the Realizable KE, and the Reynolds stress model. The RSRM forward segment consists of 11 fins. By taking advantage of the forward fin symmetry only half of one fin along the axis had to be used in making the grid...
Keywords: AERODYNAMICS; DESIGN OPTIMIZATION; TECHNOLOGY ASSESSMENT; AIRCRAFT DESIGN; AIRCRAFT INDUSTRY; AIRLINE OPERATIONS; AERONAUTICAL ENGINEERING
|Low-speed aerodynamic performance of a high-aspect-ratio supercritical-wing transport model equipped with full-span slat and part-span double-slotted flaps - Morgan, H. L., Jr.|
An investigation was conducted in the Langley V/STOL tunnel to determine the static longitudinal and lateral-directional aerodynamic characteristics of an advanced high-aspect-ratio supercritical-wing transport model equipped with a full-span leading-edge slat and part-span double-slotted trailing-edge flaps. This wide-body transport model was also equipped with spoiler and aileron control surfaces, flow-through nacelles, landing gear, movable horizontal tails, and interchangeable wing tips with...
Keywords: CIVIL AVIATION; FLIGHT CREWS; FLIGHT TRAINING; PROJECT MANAGEMENT; TRAINING SIMULATORS; AIRLINE OPERATIONS; PERSONNEL MANAGEMENT; REGULATIONS; STANDARDS
|[LaGuardia Airport Scenes, Lion and Leopard]|
Scenes on LaGuardia Airport, New York City, tarmac. Alligator, lion and leopard.
Keywords: Animals (Alligators); Reptiles; Animals (Lions); Animals (Leopard); Airports; Airline operations; New York City (Airports); LaGuardia Airport
|Optical Sensors for Use in Propulsion Control Systems - Fritsch, Klau|
This final technical report describes the results of a cooperative effort which was originally established between John Carroll University and the Instrumentation and Control Technology Division at NASA Lewis Research Center on November, 1982, and then continued with the Engine Sensor Technology Branch at NASA Lewis until March, 1995. All work at John Carroll University was directed by the principal investigator of this grant, Klaus Fritsch, Ph.D...
Keywords: AIR TRANSPORTATION; INEQUALITIES; FREQUENCIES; AIRCRAFT SAFETY; AIRLINE OPERATIONS; FLIGHT SAFETY; SIMULATION; SEATS; CONFERENCES; SELECTION; INVENTORIES